CVE-2026-74936

CriticalCVSS 9.8

Published: 18/08/2026(UTC)Updated: 20/08/2026(UTC)Translated: 19/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.16%

5th percentile - higher than 5% of all known CVEs

Summary

Use-after-free in the JavaScript: WebAssembly component of Firefox and Thunderbird. Fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Risk Assessment

May lead to browser crash or potential code execution, posing a risk to users.

Recommendation

Update Firefox or Thunderbird to a patched version.

Original NVD description (English source)

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.